What is class polychetae - marine worms, Biology

Assignment Help:

What is Class Polychetae - Marine Worms?

The polychaetes differ from the oligochaetes in several ways. The name itself suggests one of the differences. The prefix "poly" means "many," as opposed to "oligo," meaning "few." Thus, the polychaetes have many hair-like bristles. They also have paired appendages called parapodia that bear the numerous setae. Parapodia have several functions, including helping the worms swim or crawl, as well as providing an anchoring mechanism. Parapodia, in addition, provide increased surface area for gas exchange. Most polychaetes live in marine habitats, and they can be found either living as plankton, crawling on the sea floor, or living in tubes, which the worms secrete around themselves.

Polychaetes also differ from the other two groups in that their anterior is better developed. They have a definite head region with sensory apparatus that include light-sensitive eyes.

 

 


Related Discussions:- What is class polychetae - marine worms

Infectious bursal disease, I nfe c tio u s bursal disease Infectio...

I nfe c tio u s bursal disease Infectious bursal disease (popularly known as Gumboro disease) is an acute contagious disease of young chicks caused by an RNA virus, a memb

What is the activity of cacl2 solution, What is the activity of a 0.35 M/L ...

What is the activity of a 0.35 M/L CaCl2 solution? What is the osmolarity of this solution?

Ram ventilation, Ram Ventilation Some fish do not use pumping action f...

Ram Ventilation Some fish do not use pumping action for gill ventilation. It has been known for long that large tunas cannot be kept alive in captivity unless they are put in

Nerve fibres, NERV E FIBRES - Axon or dendrite of a nerve cell cove...

NERV E FIBRES - Axon or dendrite of a nerve cell covered with one, two or three sheaths is called nerve fibre. Dendrites are surrounded only by one sheath. An axon may b

Variability in populations, Variability refers to the differences in herita...

Variability refers to the differences in heritable traits exhibited by the individuals of a species. One of the major contributions of Darwin to the study of evolution was his book

State the jackson coleman and fischer theory, Jackson Coleman and Fischer T...

Jackson Coleman and Fischer Theory Jackson Coleman Theory: During accommodation the ciliary muscle contraction causes an anterior thrust of the vitreous. This vitreous thrust p

Energy requirement during congestive cardiac failure, Q. Energy requirement...

Q. Energy requirement during congestive cardiac failure? Energy: Composition of the calorie requirements on the basis of body weight is usually not feasible due to the presence

Determine the fransworth 100 hue panel test, Determine the Fransworth 100 H...

Determine the Fransworth 100 Hue Panel Test This is a simple and useful test using colour chips arranged in a particular sequence. Colour deficient patients make errors in arra

What are the uses of national parks, Q. What are the uses of National parks...

Q. What are the uses of National parks ? National Park is an area dedicated to conserve environment, natural and historical objects and to conserve the wild life therein. Natio

Right coronary artery, Right coronary artery arises from the anterior aorti...

Right coronary artery arises from the anterior aortic sinus. It runs down along the anterior part of the coronary sulcus, reaches the lower border of heart turns round the lower bo

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd